Nuclear Spin Assisted Magnetic Field Angle Sensing
arXiv:2010.04197 · doi:10.1038/s41534-021-00374-6
Abstract
Quantum sensing exploits the strong sensitivity of quantum systems to measure small external signals. The nitrogen-vacancy (NV) center in diamond is one of the most promising platforms for real-world quantum sensing applications, predominantly used as a magnetometer. However, its magnetic field sensitivity vanishes when a bias magnetic field acts perpendicular to the NV axis. Here, we introduce a novel sensing strategy assisted by the nitrogen nuclear spin that uses the entanglement between the electron and nuclear spins to restore the magnetic field sensitivity. This, in turn, allows us to detect small changes in the magnetic field angle relative to the NV axis. Furthermore, based on the same underlying principle, we show that the NV coupling strength to magnetic noise, and hence its coherence time, exhibits a strong asymmetric angle dependence. This allows us to uncover the directional properties of the local magnetic environment and to realize maximal decoupling from anisotropic noise.
15 pages, 4 figures in main text + 11 pages, 8 figures in supplementary information
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Cited by in corpus (4)
- Nanoscale vector AC magnetometry with a single nitrogen-vacancy center in diamond
- Nanoscale Electric Field Imaging with an Ambient Scanning Quantum Sensor Microscope
- Quantum control of nuclear spin qubits in a rapidly rotating diamond
- Vector DC magnetic-field sensing with reference microwave field using perfectly aligned nitrogen-vacancy centers in diamond